Vertical hydraulic press

ABSTRACT

The press disclosed comprises a plate disposed between upper and lower fixed cross-booms, rigidly connected therewith by columns and carrying return cylinders. The plate has a central hole accomodating guides mounted therein, adjusted in accordance with the clearance and intended for a slide moving therealong, connected with a movable cross-piece and carrying a movable tool.

United States Patent [1 1 Vasilkovsky et al.

[111 r 3,797,298 [451 Mar. 19, 1974 VERTICAL HYDRAULIC PRESS [76] Inventors: Vitaly Pankratievich Vasilkovsky,

ulitsa Kirovgradskaya, 65, kv. l8; Nikolai Feodosovich Grebnev, ulitsa Novatorov, 7, kv. 8; Leonid Alexandrovich Efimov, ulitsa Khmeleva, 18, kv. 77; Georgy Pavlovich zakharov, ulitsa Kalinina, 65, kv. 53; Mikhail Ruvimovich Kavitsky, ulitsa 40 let Oktyabrya, 15 kv. 55, all of Sverdlovsk; Pavel Andreevich Malkov, ulitsa Televidenia, l, Korpus 4, kv. 34, Moscow; Petr Alexeevich Pylaikin, ulitsa Lomonosova, 9, kv. 1 l5,

' Sverdlovsk; Boris Vasilievich Rozanov, ulitsa Sharikopodshysnikovskaya, 2, Kv.

40, Moscow; Vladimir Mikhailovich Sinitsky, ulitsa 40 let Oktyabrya, 9, kv. 39; Sergei Grigorievich Khirdzhiev, ulitsa .Mashinostroitelei,

51, kv. 38, both of Sverdlovsk, all of U.S.S.R.

22 Filed: Feb. 18, 1972 21 Appl. No.: 227,421

[30] Foreign Application Priority Data Mar. 17, 1971 U.S.S.R Q. 1,628,325

[52] US. Cl. 72/453, 72/456 [51] Int. Cl B2lj 9/12 [58] Field of Search 72/453, 455, 456

[56] References Cited UNITED STATES PA ENTS FOREIGN PATENTS 0R APPLICATIONS 880,540 1/1943 France ,172/455 1,065,900 1/1954 France ..72/455 Primary Examiner-Charles W. Lanham Assistant Examiner-Gene P. Crosby Attorney, Agent, or Firm--Holman Stern [57 ABSTRACT The press disclosed comprises a plate disposed between upper and lower fixed cross-booms, rigidly connected therewith by columns and carrying return cyl- 3 Claims, 4 Drawing Figures Graham 72/453 1 VERTICAL HYDRAULIC PRESS BACKGROUND OF THE INVENTION The present invention relates to press equipment and, more particularly, to vertical hydraulic presses.

The present invention may find use in the designs of forging and, mainly, powerful stamping presses having press structures of high rigidity and which manufacture stamped articles with high precision.

Widely known in the art is a vertical hydraulic press comprising a frame resisting the operating force of the press and consisting of upper and lower fixed crossbooms and columns. Secured to the upper cross-boom are working cylinders which are provided with plungers connected with a movable cross-piece and transmitting therethrough the operating force to a movable tool. The press is also provided with return cylinders used for raising the movable cross-piece.

The movable cross-piece moves along the columns, whereby the bending moment arising during the eccentric loading of the press is transmitted to the columns; this results in additional skewing of the movable crosspiece and greater stress in the columns.

As the movable cross-piece, moves along the columns, the length of the latter is increased by the height of the cross-piece, which also decreases the rigidity of the press frame. I

Besides, the operating force transmitted to the movable cross-piece through the plungers of the working cylinders and the tool causes the bending strain of the cross-piece.

Thus, the decreased rigidity of the press frame, skew ing and bending of the movable cross-piece reduce the precision of manufacture of stamped articles.

In order to decrease the skewing of the movable cross-piece in the case of eccentric loading, the presses are equipped with complicated automatic levelling-off systems.

With the length of the columns enlarged by the height of the movable cross-piece, it becomes impossible for technological reasons to manufacture powerful presses using the column design.

SUMMARY OF THE INVENTION Another object of the present invention is to provide a press in which the bending strain of the movable cross-piece taking placevin the zone of the tool disposition would be eliminated.

Still another object of the present invention is to provide a press in which the precision of the movable cross-piece displacement, as compared to that in conventional presses of the same type, would be higher. These and other objects are accomplished by means of a vertical hydraulic press comprising a frame resisting the operating force of the press and consisting of upper and lower fixed cross booms and columns, working cylinders secured to the upper cross-boom and having plungers connected with a movable cross-piece and transmitting therethrough the force to a movable tool, and return cylinders, in which, according to the present invention, disposed between the upper and lower fixed cross-booms is a plate which rigidly. connected therewith by columns, carries the return cylinders and has a central hole accomodating guides mounted therein, adjusted in accordance with the clearance and intended for a slide moving therealong, carrying the movable tool and connected with the movable cross-piece.

All this makes it possible to raise the precision of manufacture of stamped. articles and to decrease the weight of the press.

In order to decrease the length of the column and make it simpler to assemble the press, the plate has, two rows of columns rigidly secured therein, of which rows one connects the plate with the upper fixed cross-boom and the other one with the lower fixed cross-boom.

In order to provide for a reliable fixture of the guides on the plate and an easier adjustment of the'clearance between the slide and the guides, the latter are designed as wedges provided with a slot.

BRIEF DESCRIPTION OF THE DRAWINGS The following detailed description of a specific exemplary embodiment of the present invention is given with reference to the accompanying drawings, in which:

FIG. 1 shows a general view of the press; FIG. 2 shows a section taken along line II-II of FIG.

FIG. 2A shows a magnified section of the press shown in FIG. 2, showing the guides for the slide and their means of adjustment.

FIG. 3 shows a section taken along line III-III of FIG. 2.

DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT A vertical hydraulic press comprises a frame which consists of a lower fixed cross-boom 1 (FIG. 1), an upperfixed cross-boom 2, a plate 3 and columns with nuts 4. Besides, the press comprises working cylinders 5 with plungers 6, return cylinders 7, a movable crosspiece 8 connected with a slide 9 (FIG. 2), a sliding table 10. (FIG. 1), cylinders 11 for moving the table,

side pushers12, supports 13 of the press, and fixed 14 (the lower die) and movable 15 (the upper die) tools.

The main component of the press is the frame that resists the force-necessary for deforming the workpiece (not shown in the drawing) and developed by the working cylinders 5 when a high-pressure working liquid is supplied thereinto. The frame has the lower and upper fixed cross-booms 1 and 2 designated, respectively, at the plate 3 disposed between the latter and the col umns. The ends of the columns are provided with threadings which with the aid of the nuts 4 provide for arigid connection of the column with the cross-booms 1,2 and the plate 3. In order to decrease the length of the columns and, consequently, to make them' more technological and to raise the rigidity of the frame, the columns are divided along their length into two rows. Columns 16 ,of one row connect the plate 3 withthe lower fixed cross-boom l and determine, in the long row connect the plate 3 with the upper fixed crossboom 2.

The lower fixed cross-boom 1 is mounted on the supports 13 secured in a foundation 18 and carries the sliding table which mounts either directly or through the intermediary of a set of compression plates the tool 14 (the lower die) which is motionless in the course of stamping. With the aid of the cylinders 11 specially provided for the purpose and mounted on the foundation 18 the table 10 can be moved to both sides from the axis of the press onto bridges 19 which by one end portion are connected with the lower fixed cross-boom l and by the other end portion rest upon the foundation 18. Secured to the bridges 19 are pushers 12 designed to raise the article above the die.

The working cylinders 5 are made as drums 20 (FIGS. 3) having inserted bottoms 21 secured thereto. The space between the drums 20 and the bottoms 21 is packed with the aid of heringbone sealings (not shown in the drawing).

The inserted bottoms 21 of the working cylinders 5 rest upon the upper fixed cross-boom 2 and are secured thereto. The plungers 6 of the working cylinders 5 rest upon the movable cross-piece 8 and transmit the operating force to the latter. From the cross-piece 8 the operating force is transmitted through the slide 9 connected thereto to the movable tool (the upper die) which is mounted on the slide 9, the latter may be made integral with the cross-piece. Employment of the slide 9 completely eliminates the bending strain in the zone of the tool fixture.

The slide 9 moves in the guides 22 (FIG. 2) which are mounted on the plate 3 in a central hole made in the latter.

With the slide 9 disposed through the hole of the plate 3, the skewing of the movable tool 15 is substantially decreased and the column 16 is released from the bending moment during the case of ecentric application of loading.

The guides 22 are made as wedges which with the aid of adjusting screws 25 can bedisplaced in the direction perpendicular to the movement of the slide 9, which makes it possible to set up most favourable clearances both from the viewpoint of the slide movement and from the viewpoint of its possible skewing. In order to preclude their displacement in the direction of the movement of slide 9, the guides 22 are provided with slots 23 (FIGS. 3) by means of which they are connected with the plate 3.

In case they cannot be made integral owing to their large dimentions and weight, the upper and lower fixed cross-booms l, 2, the plate 3 and the movable crosspiece 8 with the slide 9 may consist of several parts. These composite parts are rigidly interconnected with the aid of coupling pins and keys.

The plate 3 mounts the return cylinders 7 whose plungers 24 (FIG. 3) are connected with the movable cross-piece 8.

For manufacturing articles having cavities the press may be equipped with side breaching devices (not shown in the drawing)l The press according to the present invention functions as follows. With a workpiece (not shown in the drawings) to be processed disposed on the fixed tool 14,- under the action of the low-pressure working liquid and the weight of the press movable parts (the plungers 6, the movable cross-piece 8 with the slide 9, the movable tool 15) the movable cross-piece 8 with the movable tool 15 secured on the slide 9 performs an idle motion until the movable tool 15 contacts the workpiece.

Then, under the action of the high-pressure Working liquid the afore-said units perform an operating motion, and the workpiece is-d'eformed by the tools 14 and 15. Thereby, the pressure of the working liquid, providing for the operating force of the press, is transmitted through the plungers 6, the movable cross-piece 8 and the slide 9 to the movable tool 15, and through the bottoms 21, the upper fixed cross-boom 2, the nuts 4, the columns 17, the plate 3, the nuts 4, the columns 16, the lower fixed cross-boom 1 and the table 10 to the fixed tool 14.

With the working motion completed, the return cylinders 7 brings the movable parts of the press to their initial position by forcing the working liquid out of the spaces of the cylinders 5. The table 10 is moved by the cylinders 10 from under the press to the bridge 19, while the pusher 12 raises the article above the unit of the fixed tool 14 to be subsequently transported.

If need be, the press may be provided with a central pusher, in which case the pushing operation may be effected without displacing the table 10.

The design of the press according to the present invention, as compared to the conventional ones, makes it possible to increase the rigidity of the frame of the press due to the smaller length of the columns; to decrease the skewing of the movable tool in thecase of eccentric application of the loading owing to the rigid displacement of the slide; to preclude transfer of bending moments arising in the case of skewing of the movable cross-piece to the columns; to eliminate the effect exerted on the movable tool by the bending strain of the movable cross-piece, and, as a result of all this, to raise the precision of manufacture of stamped articles by the press.

Besides, it is possible to dispense with the device used for automatic levelling-off of the movable cross-piece undergoing the action of eccentrically applied loads.

The manufacture of a press of a power of SO 60 thousand tons according to the present invention, as compared to that of conventional presses of the same power, provides for asubstantial decrease in metal consumption.

What we claim is:

1. A vertical hydraulic press providing an operating force and comprising: 1

a frame means resisting said operating force of said press, said frame means consisting of upper and lower fixed cross-booms and columns;

a movable cross-piece;

a movable tool;

working cylinders secured to said upper cross-boom, said working cylinders having plungers, connected with said movable cross-piece said plungers transmitting said operating force through said movable cross-piece to said movable tool;

return cylinders;

a slide connected to said movable cross-piece, said slide carrying said movable tool; and

a plate disposed between said upper and lower fixed cross-booms, rigidly connected therewith by means of said columns and carrying said return cylinders, said plate having a central hole.

2. A press as claimed in claim 1, wherein said plate has first and second rows of columns, rigidly secured embodied as wedges that are able to be moved, said guides having a slot for attaching said guides to said plate. 

1. A vertical hydraulic press providing an operating force and comprising: a frame means resisting said operating force of said press, said frame means consisting of upper and lower fixed cross-booms and columns; a movable cross-piece; a movable tool; working cylinders secured to said upper cross-boom, said working cylinders having plungers, connected with said movable crosspiece said plungers transmitting said operating force through said movable cross-piece to said movable tool; return cylinders; a slide connected to said movable cross-piece, said slide carrying said movable tool; and a plate disposed between said upper and lower fixed cross-booms, rigidly connected therewith by means of said columns and carrying said return cylinders, said plate having a central hole.
 2. A press as claimed in claim 1, wherein said plate has first and second rows of columns, rigidly secured therein, said columns of said first row connecting said plate with said upper fixed cross-boom, and said columns of said second row connecting said plate with said lower fixed cross-boom.
 3. A press as claimed in claim 1, wherein guides are embodied as wedges that are able to be moved, said guides having a slot for attaching said guides to said plate. 